git.sesse.net Git - movit/blob - effect_chain_test.cpp

   1 // Unit tests for EffectChain.
   2
   3 #include "effect_chain.h"
   4 #include "flat_input.h"
   5 #include "sandbox_effect.h"
   6 #include "opengl.h"
   7 #include "gtest/gtest.h"
   8
   9 #include <stdio.h>
  10 #include <math.h>
  11
  12 #include <algorithm>
  13
  14 class EffectChainTester {
  15 public:
  16         EffectChainTester(const float *data, unsigned width, unsigned height, ColorSpace color_space, GammaCurve gamma_curve)
  17                 : chain(width, height), width(width), height(height)
  18         {
  19                 ImageFormat format;
  20                 format.color_space = color_space;
  21                 format.gamma_curve = gamma_curve;
  22
  23                 FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, width, height);
  24                 input->set_pixel_data(data);
  25                 chain.add_input(input);
  26         }
  27
  28         EffectChain *get_chain() { return &chain; }
  29
  30         void run(float *out_data, ColorSpace color_space, GammaCurve gamma_curve)
  31         {
  32                 ImageFormat format;
  33                 format.color_space = color_space;
  34                 format.gamma_curve = gamma_curve;
  35                 chain.add_output(format);
  36                 chain.finalize();
  37
  38                 glViewport(0, 0, width, height);
  39                 chain.render_to_screen();
  40
  41                 glReadPixels(0, 0, width, height, GL_RED, GL_FLOAT, out_data);
  42
  43                 // Flip upside-down to compensate for different origin.
  44                 for (unsigned y = 0; y < height / 2; ++y) {
  45                         unsigned flip_y = height - y - 1;
  46                         for (unsigned x = 0; x < width; ++x) {
  47                                 std::swap(out_data[y * width + x], out_data[flip_y * width + x]);
  48                         }
  49                 }
  50         }
  51
  52 private:
  53         EffectChain chain;
  54         unsigned width, height;
  55 };
  56
  57 void expect_equal(const float *ref, const float *result, unsigned width, unsigned height)
  58 {
  59         float largest_difference = -1.0f;
  60         float squared_difference = 0.0f;
  61
  62         for (unsigned y = 0; y < height; ++y) {
  63                 for (unsigned x = 0; x < width; ++x) {
  64                         float diff = ref[y * width + x] - result[y * width + x];
  65                         largest_difference = std::max(largest_difference, fabsf(diff));
  66                         squared_difference += diff * diff;
  67                 }
  68         }
  69
  70         const float largest_difference_limit = 1.5 / 255.0;
  71         const float rms_limit = 0.5 / 255.0;
  72
  73         EXPECT_LT(largest_difference, largest_difference_limit);
  74
  75         float rms = sqrt(squared_difference) / (width * height);
  76         EXPECT_LT(rms, rms_limit);
  77
  78         if (largest_difference >= largest_difference_limit || rms >= rms_limit) {
  79                 fprintf(stderr, "Dumping matrices for easier debugging, since at least one test failed.\n");
  80
  81                 fprintf(stderr, "Reference:\n");
  82                 for (unsigned y = 0; y < height; ++y) {
  83                         for (unsigned x = 0; x < width; ++x) {
  84                                 fprintf(stderr, "%7.4f ", ref[y * width + x]);
  85                         }
  86                         fprintf(stderr, "\n");
  87                 }
  88
  89                 fprintf(stderr, "\nResult:\n");
  90                 for (unsigned y = 0; y < height; ++y) {
  91                         for (unsigned x = 0; x < width; ++x) {
  92                                 fprintf(stderr, "%7.4f ", result[y * width + x]);
  93                         }
  94                         fprintf(stderr, "\n");
  95                 }
  96         }
  97 }
  98
  99 TEST(EffectChainTest, Identity) {
 100         float data[] = {
 101                 0.0f, 0.25f, 0.3f,
 102                 0.75f, 1.0f, 1.0f,
 103         };
 104         float out_data[6];
 105         EffectChainTester tester(data, 3, 2, COLORSPACE_sRGB, GAMMA_LINEAR);
 106         tester.run(out_data, COLORSPACE_sRGB, GAMMA_LINEAR);
 107
 108         expect_equal(data, out_data, 3, 2);
 109 }